August 2009 PMID 19667206

Independent evolution of knuckle-walking in African apes shows that humans did not evolve from a knuckle-walking ancestor.

Tracy L Kivell, Daniel Schmitt

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AI synopsis

What people are saying

Discussions highlight different perspectives about the study, with some users questioning the logic of the evolutionary pathways based on terms like 'contradictions' and 'too many contradictions,' while others emphasize the significance of the findings, calling it a 'game changer' for understanding human evolution. The tone varies from skeptical to intrigued, which reflects the nuanced reception of the publication’s conclusions.

AgreementNeither agree nor disagree

The discussions reflect mixed views, with some challenging the article’s conclusions while others acknowledge its significance, leading to a neutral agreement score.

InterestModerate interest

There is moderate interest, as some posts delve into technical details and implications, but others show more casual engagement.

EngagementModerate engagement

Several posts engage with specific aspects of the research, such as the independence of wrist features, indicating a moderate level of thoughtful discussion.

ImpactModerate impact

While the topic sparks interest and critical debate, it does not seem to cause widespread or transformative shifts in opinions yet.

Abstract in brief

The study shows that the wrist features previously thought to indicate knucklewalking are not consistent across all African apes and are also found in non-knucklewalking primates, suggesting these features are not reliable indicators of locomotor behavior.
Data reveals that different species of African apes have developed these wrist features independently, supporting the idea of two separate evolutionary paths: one for arboreal knucklewalking involving an extended wrist, and another for terrestrial knucklewalking with a columnar hand posture, especially in gorillas.
The findings imply that the wrist features observed in humans are more likely linked to arboreal activity rather than terrestrial knucklewalking, indicating that human bipedalism probably evolved from an ancestor that was adapted to life in the trees.]

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